Before Wavefront. LASIK surgeons relied on "sphere" and "cylinder" to describe vision correction issues affecting focus and astigmatism. These lower order aberrations will still be measured by the WaveScan diagnostic device. The measurements of sphere and cylinder are similar to measurements made during a conventional eye exam, called a manifest refraction, but are much more precise.

Lower order aberrations are still the greatest contributors to refractive errors of how light passes through the cornea. Nearsightedness, farsightedness and astigmatism are refractive errors. Also, lower order aberrations are generally more significant in their impact on your vision than higher order aberrations.

With the new WaveScan, higher order aberrations are now also identified. These higher order aberrations are different than sphere and cylinder, but have a noticeable impact on vision. The WaveScan produces test results called a "waveprint" which provides surgeons with all of the aforementioned data. This data is used to create a custom treatment plan that the surgeon implements on the V1SX Star S4 Laser.

Conventional laser vision correction before Wavefront corrected sphere and cylinder errors. The precision was limited by information provided by the phoropter (the adjustable machine in most eye doctor offices) used to measure the best spectacle (eyeglass) correction. This precision was limited to 0.25 diopter steps. With WaveScan, sphere and cylinder are measured to the hundredths of a diopter.

Technically, no two individual's eyes are exactly alike. However, using phoropter measurements, thousands of individuals can have the same prescription. The WaveScan's "fingerprint" of the eye that is unique to the individual. Therefore. Wavefront-guided LASIK will be designed specifically for each patient's eyes.

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